linux-kernel - Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction

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Message-ID: <20151106202750.GA11849@google.com>
Date:	Fri, 6 Nov 2015 20:27:50 +0000
From:	Sami Tolvanen <samitolvanen@...gle.com>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	Mike Snitzer <snitzer@...hat.com>,
	Mandeep Baines <msb@...omium.org>,
	linux-kernel@...r.kernel.org, Mark Salyzyn <salyzyn@...gle.com>
Subject: Re: [dm-devel] [PATCH 0/4] dm verity: add support for error
 correction

On Fri, Nov 06, 2015 at 08:20:15PM +0100, Zdenek Kabelac wrote:
> i.e. you have 1G of space - you want to give 250MB as 'redundancy' -
> so create 4 partition....

We cannot afford to set aside 25% of read-only partition space for
redundancy on mobile devices, and would rather not impact performance
any more than dm-verity already does. With error correction we have
0.8% space overhead in our use case and no performance degradation if
the partition is not corrupted.

Sami
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